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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 6661-6664 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 41 (1963), S. 668-669 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Zur Bestimmung der Uroporphyrine im Harn wurde Cellulosepulver als ausgezeichnetes Adsorptionsmittel angewendet. Man erhält ein sauberes Eluat, das sich sehr gut zur spektralphotometrischen oder fluorometrischen Messung eignet. Es wird eine genaue Analysenvorschrift angegeben.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 2613-2623 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 333 (1988), S. 55-56 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Tetrafluoroethylene (TFE) was polymerized in a 400-ml glass reaction vessel containing 200 ml water, 10 mg potassium persulphate initiator and 2g of the surfactant ammonium per-fluorodecanoate (C9F19COONH4). The polymerization was performed with stirring at 80 °C at a constant TFE pressure of ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Continuum mechanics and thermodynamics 12 (2000), S. 403-421 
    ISSN: 1432-0959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: We propose a new method for numerical simulation of gas dynamics based on kinetic theory. The method is based on a cumulant-expansion-ansatz for the phase space density, which leads to a set of quasi-linear, hyperbolic partial differential equations. The method is compared to the moment method of Grad. Both methods agree for low-order approximations but the method proposed shows additional non-linear terms for high order approximations. Boundary conditions on the cumulants for an ideally reflecting and an ideally rough boundary surface are derived from conditions on the phase space density. A Lax-method is used for numerical analysis of a 2d-BGK fluid, which results in an easy-to-implement algorithm well suited for implementation on massivly parallel computers. The results are found to agree qualitatively with predictions from moment theories.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 39 (2000), S. 542-553 
    ISSN: 1435-1528
    Keywords: Key words Lecithin organogel ; Polymer-like micelles ; Shear-induced effects ; Thinning ; Thickening
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract  The effects of shear flow on the lecithin organogels consisting of reverse polymer-like micelles have been investigated by dynamic rheology. It was established that the shear effects depended on the molar ratio of water to lecithin that determined the micellar type in the system. For an organogel with linear flexible polymer-like micelles, thinning was observed. The main features of the rheological behavior bore a resemblance to previously investigated aqueous systems made up of similar but direct polymer-like surfactant micelles. The thinning effects are explicable on the basis of alignment of micellar aggregates along the flow direction and their disentanglement. An organogel with branched micelles did not demonstrate any notable response to the shearing. Unusual behavior was noticed in the case of a jelly-like phase that included the highest amounts of water. The applied steady shear flow induced a thickening effect. This was followed by restructuring of the micellar system at the level of polymer-like micelles and their network. The shearing effects were characterized by slow kinetics. In addition, the system did not revert to the original state after the cessation of steady shear flow even within 8 h. Measurements performed in an oscillation regime on this system showed that shearing should promote a substantial growth of the polymer-like micelles and affect their alignment.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1435-1528
    Keywords: Key words Tetradecyldimethylamine oxide ; Lamellar phase ; Onion phase ; Complex fluids ; Rheopex behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract  The time-dependent transformation of an ionically charged lamellar phase (L α-phase) into a vesicle phase under the influence of shear is investigated using rheological and conductivity measurements. The L α-phase consists of the zwitterionic surfactant tetradecyldimethylaminoxide (C14DMAO), hexanol, oxalic acid and water. The experiments were carried out on the L α-phase in a well defined state. It was prepared by a special route from the neighbouring L 3-phase that consists of 100 mM C14DMAO, 250 mM hexanol and 5 mM oxalicdiethylester (OEE). The OEE hydrolyses in the L 3 -phase to oxalic acid and ethanol. The result is a virgin L α-phase which consists of stacked bilayers and which has not been exposed to shear. When this low-viscous phase is subjected to shear it is transformed into a highly viscous vesicle phase. The transformation of the L α-phase into vesicles under constant shear was monitored by recording the viscosity and conductivity with time. It is observed that at least three different time constants can be distinguished in the transformation process. The conductivity passes through a minimum (τ1) in the direction of shear. The viscosity first passes through a minimum (τ2) and then over a maximum (τ3). It is concluded that τ1 belongs to the complete alignment of the bilayer parallel to the wall, τ2 to the beginning of the break-up of the bilayers to the vesicles and τ3 to the complete transformation of the L α- to the vesicle phase. When the shear rate was varied, it was noted that the product of the time constants and shear is constant.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Advanced Materials 6 (1994), S. 116-129 
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An amphiphilic compound such as a surfactant molecule is a very simple molecule. Yet, when dissolved in water, it spontaneously self-assembles into a multitude of micellar structures such as globules, rods, disks, and vesicles. Even in dilute solutions containing only about 1 % of surfactant, these primary structures can organize themselves on a macroscopic scale so that the whole system in a test tube can be completely ordered. Such systems can have very remarkable macroscopic properties, for example, a yield stress, complex fluid behavior, or iridescence under illumination.The shape of the micellar structures is always determined by the area a that a surfactant molecule occupies at a micellar or bulk interphase. This area can be controlled or tuned by the mixing ratio X between surfactants or between surfactants and cosurfactants. The different assemblies which then result with the variation of X are discussed, together with the macroscopic properties of the systems and some applications where these properties are of use.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 186 (1962), S. 93-101 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Einleitend werden Vorteile der Chronopotentiometrie gegenüber der Polarographie diskutiert. Es werden chronopotentiometrische Konzentrationsbestimmungen mit sägezahnförmigen statt mit den üblichen rechteckigen Stromimpulsen durchgeführt. Das Verfahren ist besonders für die gleichzeitige Bestimmung mehrerer Stoffe und für kinetische Probleme geeignet. Seine Vorteile und Grenzen werden an Hand von Beispielen erläutert. Für diffusionsbestimmte Ströme ist βτ 3/2 proportional der Konzentration [β=Anstiegsgeschwindigkeit des Stromes (A/sec), gt= Transitionszeit].
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Advanced Materials 1 (1989), S. 133-134 
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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